"So, what's going on," she starts.
"From the basics - Earth isn't the only reality. It's at the center of a series of shells - kind of like the nucleus of an atom? - of different realities. Things get weirder the further 'up' you go. Dreams involve projecting into the Dreamlands, the first reality layer. Usually, just a few things are possible in the Dreamlands - taking your Ideal Form with practice, and a few people can alter the landscape by Dreaming. My mother is a powerful Dreamer, and created a city."
"But for some people it's different. There's - sort of threads from the fabric of reality - that fall from higher reality levels sometimes. Usually they just mess up the landscape, make things even odder around them. Sometimes they entangle around a person - which usually yanks them up a reality level or two when it happens. The entanglement brings with it the rules of higher realities. Minor magic like in the Magelands, the second reality layer. And idiosyncratic powers from the third reality layer or above, which vary person to person in nature and power, but are generally better than Magelands magic."
"I'm an entangled. My Ideal Form is what you see before you. My idiosyncratic power is controlling light, which is very convenient since I am light, like this."